Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
pham huu » pham duc, pham duy, phan huy
va hanh » va thanh, va danh, ban hanh
sanh ty » sach ty, canh tay
va pham » van pham, va phat, va phap
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
ca viet » va viet, co viet, hoa viet
ma hoi » mai hoi, xa hoi, ma hoa
anh ta » anh tu, anh va, anh tuan
lam ca » lam cua, lam cha, lam co

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so ((sanh ty) or (anh ta)) nang ma hoi. hieu va pham huu ((va hanh) or (van hanh)) lam ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sanh ty) OR (anh ta)) nang ma hoi. hieu va pham huu ((va hanh) OR (van hanh)) lam ca viet.
• Adding a wildcard symbol may retrieve word variants: so ((sanh ty) or (anh ta)) nang ma hoi. hieu va pham huu ((va hanh) or (van hanh)) lam ca viet*.